Year	current US$
2000	348.06542367
2001	246.79731052
2002	192.67772725
2003	250.39515971
2004	206.18249379
2005	222.92557813
2006	237.48073339
2007	264.82941733
2008	289.58221861
2009	270.59795072
2010	401.48090215
2011	435.65651616
2012	429.10033502
2013	349.77318822
2014	429.64420364
2015	343.24376944
2016	587.44290511
2017	800.68584517
2018	682.98424517
2019	849.70531695
2020	707.40885345
2021	544.1197733